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Low-temperature densification of high-entropy(Ti,Zr,Nb,Ta,Mo)C-Co composites with high hardness and high toughness

Journal of Advanced Ceramics 2022年第5期11卷 805-813页

作者： Si-Chun LUO Wei-Ming GUO kevin plucknett Hua-Tay LIN School of Electromechanical Engineering Guangdong University of TechnologyGuangzhou 510006China School of Mechanical and Electronic Engineering Pingxiang UniversityPingxiang 337000China Department of Process Engineering and Applied Science Dalhousie UniversityHalifax B3J1ZICanada

In order to prepare high toughness(Ti,Zr,Nb,Ta,Mo)C ceramics at low temperatures while maintaining high hardness,a liquid-phase sintering process combined with Co-based liquid-phase extrusion strategy was adopted in this *** densification temperature can be lowered to 1350℃,which is much lower than the solid-state sintering temperature(~2000℃)generally employed for high-entropy carbide *** sintered at 1550℃and 30 MPa applied pressure,part of the Co-based liquid-phase was squeezed out of the graphite mold,such that only~3.21 vol%of Co remained in the high-entropy *** to the Co-free solid-state sintered(Ti,Zr,Nb,Ta,Mo)C ceramics,prepared at 2000℃and 35 MPa,the hardness was slightly decreased from 25.06±0.32 to 24.11±0.75 GPa,but the toughness was increased from 2.25±0.22 to 4.07±0.13 MPa·m^(1/2).This work provides a new strategy for low-temperature densification of high-entropy carbides with both high hardness and high toughness.

关键词： high-entropy carbide ceramics liquid-phase sintering microstructure grain size mechanical properties

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Fabrication and modelling of Si_(3)N_(4)ceramics with radial grain alignment generated through centripetal sinter-forging

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Journal of Materials Science & Technology 2022年第31期126卷 1-14页

作者： Da-Wang Tan Zhen-Yong Lao Wei-Ming Guo Akira Kondo Takahiro Kozawa Makio Naito kevin plucknett Hua-Tay Lin Department of Electromechanical Engineering Guangdong University of TechnologyGuangzhou 510006China Joining and Welding Research Institute Osaka University11-1 MihogaokaIbarakiOsaka 567-0047Japan Department of Mechanical Engineering Dalhousie UniversityHalifaxNova Scotia B3H 4R2Canada

Silicon nitride(Si_(3)N_(4))based ceramics are one of the most attractive advanced engineering materials,which have been widely used under high-speed rotational operation or for mechanical contacts across a curved *** the present study,rotationally symmetric texturing of Si_(3)N_(4),with radial grain align-ment,was obtained by centripetal sinter-forging(CSF)of a partially sintered *** average values of the included angles between the c-axis of the local Si_(3)N_(4)grain and radial direction were approxi-mately 16.4°and 11.0°,on the section plane perpendicular to the pressing direction,and parallel to both the pressing and radial directions,*** compressive strain in the pressing direction forced the ceramic body to flow towards the central axis,resulting in compressive strain in the tangential di-rection and tensile strain in the radial direction.A fundamental physical model was created to simulate the grain rotation during the 3-dimentional strain reorientation,which revealed the rod-like grain would preferentially rotate toward the center of the sample under the CSF *** addition,due to the fric-tion between the sample surface and the pressing punch,the increased shear strain could enhance the Si_(3)N_(4)grain ***,ceramics with rod-like grains perpendicular to the curved side sur-face could be anticipated by applying the centripetal forming concept in a controlled manner.

关键词： Si_(3)N_(4)ceramic Texture Radial grain alignment Modeling CSF

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Textured and toughened high-entropy(Ti_(0.2)Zr_(0.2)Hf_(0.2)Nb_(0.2)Ta_(0.2))C-SiCw ceramics

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Journal of Materials Science & Technology 2021年第35期94卷 99-103页

作者： Si-Chun Luo Wei-Ming Guo Yu-Zhang Zhou kevin plucknett Hua-Tay Lin School of Electromechanical Engineering Guangdong University of TechnologyGuangzhou 510006China College of Mechanical and Electronic Engineering Pingxiang UniversityPingxiang337000China Department of Process Engineering and Applied Science Dalhousie UniversityHalifax B3J 1Z1Canada

High-entropy(Ti_(0.2)Zr_(0.2)Hf_(0.2)Nb_(0.2)Ta_(0.2))C ceramics,with different contents(0,5,10,and 20 vol.%)of Si C whiskers(SiCw),were fabricated by spark plasma sintering using raw powders synthesized via carbothermal *** application of a uniaxial compaction force led to texture development of the SiCw within the(Ti_(0.2)Zr_(0.2)Hf_(0.2)Nb_(0.2)Ta_(0.2))C *** toughness increased with the increase in SiCw content,while Vickers hardness remains almost *** toughness of(Ti_(0.2)Zr_(0.2)Hf_(0.2)Nb_(0.2)Ta_(0.2))C-20 vol.%SiCw ceramics reached 4.3±0.3 MPa m^(1/2),which was approximately 43%higher than that of the monolithic(Ti_(0.2)Zr_(0.2)Hf_(0.2)Nb_(0.2)Ta_(0.2))C ceramic(3.0±0.2 MPa m1/2).The main toughening mechanisms were attributed to crack deflection,whisker debonding,and whisker pullout.

关键词： High-entropy carbide ceramics Silican carbide whiskers Microstructure Mechanical properties Toughening mechanism

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世界粟类、薯类及杂豆类的种质资源收集与保存现状

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园艺与种苗 1984年第2期 53-56页

作者： D.L.plucknett 胡建楠孙熙年

由于高产品种的广泛推广,农民渐渐地抛弃了遗传多样性极其丰富的传统农家品种。因而随着产量的普遍增长,大多数重要粮食作物的遗传基础迅速缩小。为了抵制作物遗传的脆弱性,收集丰富的种质资源,并通过适当的技术措施,获取高产优质、抗... 详细信息

由于高产品种的广泛推广,农民渐渐地抛弃了遗传多样性极其丰富的传统农家品种。因而随着产量的普遍增长,大多数重要粮食作物的遗传基础迅速缩小。为了抵制作物遗传的脆弱性,收集丰富的种质资源,并通过适当的技术措施,获取高产优质、抗逆性强、适应性广的新品种,已成为农学家、遗传学家和育种工作者的当务之急。为此,各种作物特别是粮食作物的种质(包括其野生种)的收集与保存,就成为

关键词：期期种质保存品种资源保存国际热带农业研究所薯类豆类种质资源基因资源农业资源国际热带农业中心块茎作物南美羽扇豆

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